Create a link which allows visitors to disable a plugin?

According to the code …

// Embed Switch Links in Theme Via Shortcode
// [show_theme_switch_link]
function show_theme_switch_link_func( $atts ){
    $desktopSwitchLink  = get_option('show_switch_link_for_desktop');
    global $shown_theme;
    global $status;
    if ($shown_theme){
        $return = '<a rel="external" data-ajax="false" href="'.get_bloginfo('url').'?am_force_theme_layout=desktop" class="am-switch-btn godesktop">'.get_option('desktop_view_theme_link_text').'</a>';        
    } else {
        if ((!empty($status)) || ($desktopSwitchLink == 'yes')){
            $return = '<a href="'.get_bloginfo('url').'?am_force_theme_layout=mobile" class="am-switch-btn gomobile">'.get_option('mobile_view_theme_link_text').'</a>';
        }
    }
    return $return;
}
add_shortcode('show_theme_switch_link', 'show_theme_switch_link_func');

… you should be able to print a switch link with:

echo show_theme_switch_link_func();